strtoimax, strtoumax - convert string to integer
strtoimax(const char *nptr, char
**endptr, int base);
uintmax_t strtoumax(const char *nptr, char **endptr, int base);
On success, the converted value is returned. If nothing was found to convert, zero is returned. On overflow or underflow INTMAX_MAX or INTMAX_MIN or UINTMAX_MAX is returned, and errno is set to ERANGE.
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C99.
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